2161625113 has 12 divisors (see below), whose sum is σ = 2247438060. Its totient is φ = 2076615296.

The previous prime is 2161625111. The next prime is 2161625161. The reversal of 2161625113 is 3115261612.

It can be written as a sum of positive squares in 6 ways, for example, as 2350089 + 2159275024 = 1533^2 + 46468^2 .

It is not a de Polignac number, because 2161625113 - 2¹ = 2161625111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161625111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1573695 + ... + 1575067.

It is an arithmetic number, because the mean of its divisors is an integer number (187286505).

Almost surely, 2^2161625113 is an apocalyptic number.

It is an amenable number.

2161625113 is a deficient number, since it is larger than the sum of its proper divisors (85812947).

2161625113 is an equidigital number, since it uses as much as digits as its factorization.

2161625113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868 (or 1635 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 2161625113 is about 46493.2802994153. The cubic root of 2161625113 is about 1292.9849179198.

Adding to 2161625113 its reverse (3115261612), we get a palindrome (5276886725).

The spelling of 2161625113 in words is "two billion, one hundred sixty-one million, six hundred twenty-five thousand, one hundred thirteen".